AS1281 154.63.72.0/21 CIDR and IP Range Summary.ASN: 1281 - PSINet Inc.Host Count: 2046Addressable IPs: 2048154.63.72.0/24154.63.73.0/24154.63.74.0/24154.63.75.0/24154.63.76.0/24154.63.77.0/24154.63.78.0/24154.63.79.0/24